Why not try teaching responsible sex rather than just throwing contraception at the problem?
Christian communities have tried this, and failed. Teens will be teens, and hormones will be hormones. Preacher's kid or no preacher's kid, they will have sex.
If sex were practiced only in the bonds of matrimony a lot of problems would be solved.
Indeed. And if nobody robbed anybody else, a lot of problems would be solved too. Sadly, human nature rears its ugly head. So the next best thing is to do what Scandinavian nations have done -- made sex seem perfectly normal and natural, provide ready education, provide contraception, and remove a lot of the taboo aspects of sex. Result? Fewer abortions, fewer unwanted pregnancies, fewer STDs, fewer problems.
Teens will have sex no matter what. Might as well deal with that reality rather than pretend you can change nature.